I found a great poem by Paul Bindel on the SCA's Conservation Nation blog, which begins:
We did not roll up our sleeves.
We proofed ourselves in plastic and
into the rain, to slough in rocks,
to upturn stones. We set them so they
would not wiggle. We imagined
below a mossy corner, a foot of dirt,
It's a great poem for anyone who's ever hauled rock on a volunteer trail project. Read the whole poem here.